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                            <div style="color:gray; word-break: break-all; font-size:12px;">原英文版地址: <a href="https://www.elastic.co/guide/en/elasticsearch/reference/7.7/ignore-above.html" rel="nofollow" target="_blank">https://www.elastic.co/guide/en/elasticsearch/reference/7.7/ignore-above.html</a>, 原文档版权归 www.elastic.co 所有<br/>本地英文版地址: <a href="../en/ignore-above.html" rel="nofollow" target="_blank">../en/ignore-above.html</a></div>
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<strong>重要</strong>: 此版本不会发布额外的bug修复或文档更新。最新信息请参考 <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html" rel="nofollow">当前版本文档</a>。
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<span class="breadcrumb-link"><a href="index.html">Elasticsearch Guide [7.7]</a></span>
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<span class="breadcrumb-link"><a href="mapping-params.html">Mapping parameters</a></span>
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<span class="breadcrumb-node"><code class="literal">ignore_above</code></span>
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<h2 class="title">
<a id="ignore-above"></a><code class="literal">ignore_above</code><a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/7.7/docs/reference/mapping/params/ignore-above.asciidoc">edit</a>
</h2>
</div></div></div>
<p>Strings longer than the <code class="literal">ignore_above</code> setting will not be indexed or stored.
For arrays of strings, <code class="literal">ignore_above</code> will be applied for each array element separately and string elements longer than <code class="literal">ignore_above</code> will not be indexed or stored.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>All strings/array elements will still be present in the <code class="literal">_source</code> field, if the latter is enabled which is the default in Elasticsearch.</p>
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<div class="pre_wrapper lang-console">
<pre class="programlisting prettyprint lang-console">PUT my_index
{
  "mappings": {
    "properties": {
      "message": {
        "type": "keyword",
        "ignore_above": 20 <a id="CO345-1"></a><i class="conum" data-value="1"></i>
      }
    }
  }
}

PUT my_index/_doc/1 <a id="CO345-2"></a><i class="conum" data-value="2"></i>
{
  "message": "Syntax error"
}

PUT my_index/_doc/2 <a id="CO345-3"></a><i class="conum" data-value="3"></i>
{
  "message": "Syntax error with some long stacktrace"
}

GET my_index/_search <a id="CO345-4"></a><i class="conum" data-value="4"></i>
{
  "aggs": {
    "messages": {
      "terms": {
        "field": "message"
      }
    }
  }
}</pre>
</div>
<div class="console_widget" data-snippet="snippets/761.console"></div>
<div class="calloutlist">
<table border="0" summary="Callout list">
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO345-1"><i class="conum" data-value="1"></i></a></p>
</td>
<td align="left" valign="top">
<p>This field will ignore any string longer than 20 characters.</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO345-2"><i class="conum" data-value="2"></i></a></p>
</td>
<td align="left" valign="top">
<p>This document is indexed successfully.</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO345-3"><i class="conum" data-value="3"></i></a></p>
</td>
<td align="left" valign="top">
<p>This document will be indexed, but without indexing the <code class="literal">message</code> field.</p>
</td>
</tr>
<tr>
<td align="left" valign="top" width="5%">
<p><a href="#CO345-4"><i class="conum" data-value="4"></i></a></p>
</td>
<td align="left" valign="top">
<p>Search returns both documents, but only the first is present in the terms aggregation.</p>
</td>
</tr>
</table>
</div>
<div class="tip admon">
<div class="icon"></div>
<div class="admon_content">
<p>The <code class="literal">ignore_above</code> setting can be updated on
existing fields using the <a class="xref" href="indices-put-mapping.html" title="Put mapping API">PUT mapping API</a>.</p>
</div>
</div>
<p>This option is also useful for protecting against Lucene’s term byte-length
limit of <code class="literal">32766</code>.</p>
<div class="note admon">
<div class="icon"></div>
<div class="admon_content">
<p>The value for <code class="literal">ignore_above</code> is the <em>character count</em>, but Lucene counts
bytes. If you use UTF-8 text with many non-ASCII characters, you may want to
set the limit to <code class="literal">32766 / 4 = 8191</code> since UTF-8 characters may occupy at most
4 bytes.</p>
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